Long draft spinning mechanism



March 12, 1935. J JESSEN Re. 19,495

LONG DRAFT SPINNING MECHANISM Original Filed May 28, 1951 F: 5.5. v 4!INVENTOR.

' ATTORNEYS Reissued Mar. 12, 1935 UNITED STATES LONG DRAFT SPINNINGMECHANISM John A. Jessen, Whitinsville, Mass, assignor to Whitin MachineWorks, Whitinsville, Mass, a corporation of Massachusetts Original No.1,914,603, dated June 20, 1933, Serial No. 540,666, May 28, 1931.

Application for reissue December 21, 1934, Serial No. 758,651

4 Claims.

This invention relates to-long draft spinning mechanism in which textilefibres are forwarded from feed rolls to drawing rolls by means of shortbelts having closely adjacent and substantially parallel runs, betweenwhich the fibres are directed. These belts are positioned in part byupper and lower rolls, at least one of which is driven. The belts arealso positioned in part by guide-rods, located at the delivery end ofthe parallel belt runs and holding the belts in definitely spacedrelation at the delivery point.

It has been found that the round guide-rods heretofore commonly usedaccumulate lint and short fibers. This material wraps itself around theguide-rods, thus in effect increasing the diameter of the guide-rods anddecreasing the distance between the parallel belt runs at the deliverypoint. This varies the drawing action of the long draft mechanism.

- It is the general object of my present invention to provide guide-rodsof improved construction for use in long draft mechanism, so designedthat the accumulation of lint and fibre thereon is effectivelyprevented.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of the invention and a slight modification thereof areshown in the drawing, in which Fig. 1 is a sectional side elevation ofparts of a long draft spinning mechanism having my invention embodiedtherein;

Fig. 2 is an end view of the mechanism, looking in the direction of thearrow 2 in Fig. 1;

Fig. 3 is a side elevation of the frame in which the upper roll andguide-bars are supported;

Fig. 4 is a side elevation of one form of my improved guide-bar;

Fig. 5 is a plan view thereof;

Fig. 6 is a plan view of a slightly modified guide-bar, and

Fig. 7 is a partial side elevation of a guide frame for supporting thetype of guide-bar shown in Fig. 6.

Referring to the drawing, I have shown portions of a long draft spinningmechanism including feed rolls 10 and 11 for the fibre F, drawing rolls12 and 13 from which the yarn Y is delivered, and long draft rolls 15and 16 for the upper and lower long draft belts 20 and 21.

A guide frame is mounted on the lower long draft roll 16 and comprisesside members and 26 and cross frame members 27 and 28.

The side frame members are recessed, as indicated at 30, to fit overreduced portions of the long draft roll 16, and are also provided withupper recesses 32 to receive the upper long draft roll 15.

The side members .25 and 26 are also provided with shoulders 33 andprojections 34 for positioning a pair of'guide-bars 35, preferablyconnected at one end to form an integral U-shaped member. The guide-bars35 are positioned above and below the projections 34, with the lowerguide-bar resting on the shoulders 33 of the side members 25 and 26.

The guide-bars 35 are provided with notches 3'7 at one end and shoulders38 :at the other end. When the bars are positioned in the guideframe,the notches 37 slip over the edge of the frame member 26, while theshoulders 38. engage the inner face of the frame member 25.

The guide-barsv are. thus securely held from lateral or endwisedisplacement, and are prevented from slipping downwardly toward thedrawing rolls 12 and 13 by the belts 20 and 21, which encircle the rolls15 and 1'6.and also the upper and lower guide-bars 35.

Reference to Figs. 1 and 5 will show that the guide-bars are found ofrelatively wide fiat stock, preferably having rounded edges. As shown inthe drawing, the width of the stock is preferably not less than twicethe thickness of the stock and may be substantially more than twice thethickness.

The construction shown in Figs. 6 and 7 is substantially the same asthat previously described, except that the guide-bars 40 are formed asseparate units, and that the side frames 41 (Fig. '7) are provided withadditional upper lugs or projections 42 to prevent upward displacementof the upper guide-bar 40. Otherwise the constructions are identical.The projections in both cases form notches for the upper and lowerguide-bars which notches are parallel with the path of fibre travel andserve to retain the fiat faces of the bars also substantially parallelthereto.

The great advantage of my invention rests in the provision of guide-barsof much increased width in place of the round rods previously used. Ihave found by actual test that these guide-bars of increased width, suchas are shown in the drawing, do not accumulate lint or short fibres aswas the case with the round guide-rods previously used, and consequentlythe space between the parallel runs of the belts is not reduced by suchaccumulations. Consequently uniform ac- 55 tion of the long draftmechanism is achieved and the quality of the product is improved.

Such flat guide bars, while securely interlocked to the notches orframe, are nevertheless quickly removable, by pulling forwardly on theprojecting end and stretching the belt sufficiently to permitdisengagement of the shouldered formation.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

1. In a long draft spinning apparatus, upper and lower long draft rolls,a guide frame mounted on the lower roll and positioning the upper roll,upper and lower short belts for said rolls, and guide-bars mounted onsaid guide frame or said belts, said guide-bars being formed as parts ofa U-shaped member and each guidebar being formed of flat stock ofsubstantial Width, said frame having a projection closely fittingbetween the upper and lower parts of said U-shaped guide member andholding said parts in predetermined spaced relation, and said framehaving a shoulder underlying and supporting the lower guide bar.

2. In a long draft spinning apparatus, upper and lower long draft rolls,a guide frame mounted on the lower roll and positioning the upper roll,upper and lower short belts for said rolls, and guide-bars mounted onsaid guide frame for said belts, said guide-bars'being formed as partsof a U-shaped member andeach guide-bar being formed of fiat stock ofsubstantial width, said frame having a projection closely fittingbetween the upper and lower parts of said U- shaped guide member andhaving a shoulder underlying andsupporting the lower guide bar and saidguide-bars being notched to receive the edge of one side of saidfram'eand having shoulders abutting the inner face of the other side ofsaid frame.

3. In long draft spinning mechanism of the kind having front and rearpairs of draft rolls; a guide frame the body of which is held fixedbetween them and draft belts within the frame encircling the rear rollsand conducting the fibres close, into the bite of the front rolls; theimprovement which consists of a removableflat sectioned guide-bar memberencircled by the front end of one of said belts and seated in a notchformed in a front edge of said frame, the notch being parallel to thepath of the fibre and holding said bar member with its fiat facesubstantially parallel to said path, said bar member having a shoulderedformation on its rear edge for engaging the edge of said notch in theframe to prevent'endwise shifting of the bar member and being normallyheld thus interlocked with the frame by the tension of the draft beltwhich encircles it, said bar member further having an end portionprojecting beyond the side of the frame forming a finger hold suited foruse to stretch the belt forwardly to disengage said guide-bar memberfrom the guide frame and permit the guide-bar memher to be removedendwise from Within said belt and from within the notch of said frame.

4. In long draft spinning mechanism of the kind having front andrear'pairs of draft rolls, a guide frame the body of which is held fixedbetween them and draft belts within the frame encircling the rear rollsand conducting the fibres close into the bite of the front rolls; theimprovement which consists of two separate flat-faced guide-bar membersrespectively encircled by the front ends of said belts and removablyseated in notches formed in the front portion of said frame, the notchesbeing parallel to the path of the fibre and holding said bar members inspaced relation from each other with their flat faces substantiallyparallel to said path, said bar members having shouldered formations ontheir rear edges for engaging the edge of said notches in the frame toprevent endwise shifting of the bar members and being normally held thusinterlocked with the frame: by the tension of the draft beltswhich'encircle them, said bar members further having end portionsprojecting beyond the side of the frame forming finger holds suited foruse to stretch their respective belts forwardly to disengage saidguide-bar members from the guide frame and permit them to beindividually removed endwisefrom withintheir belts and from with in thenotches of said frame.

JOHN A. JESSEN

